A human's ability to feel for those around them is an anomaly among other species. Every human being is unique and everyone feels differently, but everyone has deep feelings for themselves and others. Brain May wrote an article about what makes the human race unique: he stated that the kindness of a human being is a unique characteristic. A BBC documentary has also been created, which also explores this idea. In the video What Make Us Human, Professor Alice Roberts studies our closest species, chimpanzees. A certain experiment was performed in which two chimpanzees had to work together to get a snack that was offered. The children also did this experiment but instead of receiving a snack they received marbles. When they were both finished, the professor noted that chimpanzees only want the snack, and if one of them had received the snack first he wouldn't have bothered to continue helping the other chimpanzee. On the other hand, when children were tested, there was a control test in which both children received an equal amount of marbles and another test